Onsemi MC14093BDR2G Quad 2-Input NAND Schmitt Trigger: Datasheet, Pinout, and Application Circuits

The MC14093BDR2G from Onsemi is a highly reliable quad 2-input NAND Schmitt trigger integrated circuit belonging to the venerable 4000 series CMOS logic family. This device integrates four independent NAND gates, each featuring Schmitt-trigger input circuitry. This unique combination makes it an exceptionally versatile component for signal conditioning, noise immunity, and waveform generation in a wide array of digital and analog applications.

This article provides a detailed overview of its datasheet specifications, pinout configuration, and practical application circuits.

Datasheet Overview and Key Specifications

The MC14093B operates over a wide voltage range, typically from 3V to 18V, making it suitable for both 5V TTL and higher voltage systems. The Schmitt-trigger inputs are its defining feature, providing hysteresis—a difference between the positive-going (V_P) and negative-going (V_N) input threshold voltages. This hysteresis ensures that the output will switch cleanly and only once, even when the input signal is slow or noisy.

Key electrical characteristics (at VDD = 10V):

High-Level Output Voltage (V_OH): Typically 9.99V (min)

Low-Level Output Voltage (V_OL): Typically 0.05V (max)

Input Hysteresis (ΔV_T): Typically 0.9V (min)

Propagation Delay: Typically 200ns

The device is characterized for operation from -55°C to +125°C, offering robustness for industrial and automotive environments. The "DR2G" suffix denotes a SOIC-14 package, which is suitable for automated PCB assembly.

Pinout Configuration

The MC14093BDR2G comes in a standard 14-pin package. The pinout is as follows:

Pins 1, 2, 13: Gate 1 Inputs (A, B) and Output (Q)

Pins 3, 4, 5: Gate 2 Inputs (A, B) and Output (Q)

Pins 6, 8, 9: Gate 3 Inputs (A, B) and Output (Q)

Pins 10, 11, 12: Gate 4 Inputs (A, B) and Output (Q)

Pin 7: Ground (VSS)

Pin 14: Positive Supply Voltage (VDD)

Each gate functions as a standard NAND gate, but the Schmitt-trigger input modifies its switching behavior, making it immune to input noise smaller than the hysteresis voltage.

Application Circuits

The MC14093B's primary function is to clean up noisy digital signals. A slow or noisy input signal connected to a standard logic gate can cause multiple output transitions. The hysteresis of the MC14093B prevents this, producing a single, clean digital output transition.

Beyond noise immunity, its most common application is as a simple relaxation oscillator or square wave generator. Only a single gate, one resistor, and one capacitor are required.

1. Basic Square Wave Oscillator:

Connect the output of one gate (e.g., pin 3) back to its input (pin 1) through a resistor (R). Place a capacitor (C) from the input (pin 1) to ground. The output will produce a continuous square wave. The frequency of oscillation is approximately given by f ≈ 1 / (0.8 R C). This simple circuit is perfect for creating clock signals or timing pulses.

2. Pulse Generator (One-Shot):

By combining the RC network with the Schmitt-trigger's precise thresholds, the MC14093B can be configured as a monostable multivibrator. An input trigger pulse causes the circuit to generate a single output pulse with a precise width (T) determined by T ≈ R C.

3. Level Translator:

Due to its wide operating voltage range, the MC14093B is excellent for interfacing between logic families operating at different voltage levels (e.g., translating a 3.3V signal to a 12V signal).

ICGOODFIND: The Onsemi MC14093BDR2G is an indispensable component for designers seeking robust digital logic. Its integrated Schmitt-trigger inputs solve common real-world problems like signal noise and bounce, while its simple RC oscillator configuration makes it a go-to for generating stable clock signals. Its wide voltage range and CMOS low-power characteristics ensure its continued relevance in both modern and legacy designs.

Keywords:

1. Schmitt Trigger

2. Hysteresis

3. Noise Immunity

4. Oscillator

5. CMOS Logic